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Secosteroid

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Types or subclasses of secosteroids are defined by the carbon atoms of the parent steroid skeleton where the ring cleavage has taken place. For example, 9,10-secosteroids are derived from cleavage of the bond between carbon atoms C9 and C10 of the steroid B-ring (similarly 5,6-secosteroids, 13,14-secosteroids, etc.).

The prototypical secosteroid is cholecalciferol (vitamin D3). Its IUPAC systematic is "(5Z,7E)-(3S)-9,10-secocholestra-5,7,10(19)-trien-3-ol".

Some nonsteroidal estrogens, like doisynolic acid (cleaved on the D ring) and allenolic acid, are also secosteroids or secosteroid-like compounds.

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